When should I start potty training my child? I've seen shows and read …

When should I start potty training my child? I've seen shows and read articles that say it shouldn't be done before 1-1.5 years old because the child doesn't understand anything yet. However, I have many acquaintances who started potty training as early as infancy and their children were already asking for the toilet at 1-1.3 years old. How did you do it? Maybe someone knows how to quickly teach a toddler? ?‍♀️